I am very sorry to read that he has raped you again - this will continue happening until you leave and will keep escalating in nature too. I think you need to get out this week (it was me who posted about the neck before and I am very, very concerned for you that his abuse is going to escalate more quickly than you are hoping it will).
Will you be at work tomorrow? Can you talk with one or more colleagues then? When could you talk to your friend?
Then next time you're at work I would write a note and disclose to one of the savvy colleagues at the start of the day. Use the template someone wrote above and finish it: "I need help to disclose to <insert your line manager's name here> so that I can use today to contact professional services. The abuse is escalating rapidly and I am very worried that I don't have much time to get out. He has WFH all of the Easter holidays so I haven't been able to reach out for help from home."
Then ring Women's Aid and reread your note and ask them to help you to make a safety plan, if you can't get through to them then ring the police (they didn't arrest my colleague's husband then but put a marker on my colleague's house so if someone from in the property rang 999 they wouldn't need to say anything, the police would just come straight away), social services (my colleague had support from them to leave and keep him away from the children, it was massively useful they'd been involved from just before she left), the children's school, Women's Aid etc. Form a safety plan and get yourself and your babies out of there.
This cannot carry on, we all know he won't stop it so unfair as it is my love you're going to have to be the one to make it stop. Be strong for yourself and your children.